Season 1

With a little help from Pinky, Brain pumps water in to a bottle which, when it can't take any more, blasts off like a rocket. After bouncing off a lamp, the bottle lands on one end of a scale, catapaulting a weight from the other end. The weight crashes into a spoon, which then gets thrown into the lock, handle first. Brain then uses the spoon handle to pick the lock.

Brain catapaults a paper ball which lands on one end of a loaf of bread, causing a knife stuck in the other end to be catapaulted in to the lock. The force of the knife's impact then causes the lock and the cage door to open.